78648581 has 32 divisors (see below), whose sum is σ = 95232000. Its totient is φ = 64152000.

The previous prime is 78648571. The next prime is 78648587. The reversal of 78648581 is 18584687.

It is a happy number.

It is not a de Polignac number, because 78648581 - 2⁶ = 78648517 is a prime.

It is a super-2 number, since 2×78648581² = 12371198586627122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78648587) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 395120 + ... + 395318.

It is an arithmetic number, because the mean of its divisors is an integer number (2976000).

Almost surely, 2^78648581 is an apocalyptic number.

It is an amenable number.

78648581 is a deficient number, since it is larger than the sum of its proper divisors (16583419).

78648581 is a wasteful number, since it uses less digits than its factorization.

78648581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321.

The product of its digits is 430080, while the sum is 47.

The square root of 78648581 is about 8868.4035203637. The cubic root of 78648581 is about 428.4468594733.

The spelling of 78648581 in words is "seventy-eight million, six hundred forty-eight thousand, five hundred eighty-one".